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 Post subject: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Sat Nov 18, 2017 10:52 am 
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I just replaced the standard diff centre in my 1300 with a 323 3.9 long nose centre. My car currently runs the standard 4-speed. Obviously the standard tailshaft didn't fit but we found an RX3 shaft (to suit standard long nose 12A/1600 diff and rotary 4-speed) was the correct length which has helped to get the car moving under its own power again. The 5-speed is 20mm longer so we need a tailshaft about 1100mm long from the diff flange to the yoke approx. 20mm from the bottom end of the yoke to allow for some movement. Any thoughts on a standard Mazda shaft that may suit? Will need to have the 60x45mm flange pattern and the deep recess on the flange to clear the big nut on the pinion flange.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Sat Nov 18, 2017 2:17 pm 
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What 5 speed did you use? I put one from as 323 in a 1300 years ago and I don't recall having any tailshaft issues, the stock 4 speed is same as 323 overall length and 4 and 5 speeds are the same I thought.

I also put a 12A and RX-5 5 speed in my 1300 now with R100 diff and I reckon I've got early RX-7 tailshaft in that.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Sat Nov 18, 2017 11:34 pm 
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Yes I used a 323 5-speed. The box is definitely longer then the 4-speed, by about 20mm. It is possible that if I still had the standard diff centre there may have been just enough extra unused length on the yoke to accommodate this but it would surely have been near the bottom which wouldn't allow for much movement during suspension travel.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Sun Nov 19, 2017 2:04 am 
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chop 10mm? not as brutal as it sounds. i ran that way for a long time

i suspect your option that is a shorter single than rx3 is s1-2 rx7 . i think a little long is better than a little short

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Mon Nov 20, 2017 7:06 pm 
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Custom is probably the easiest option. It's amazing that the RX3 tailshaft is so close to the correct length.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Mon Nov 20, 2017 7:38 pm 
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I honestly cant remember whether I had long or short centre, but it was definitely a standard 1300 tailshaft I used.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Tue Nov 21, 2017 2:43 pm 
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There are apparently 2 diff versions of the 323 5 speed. Someone else said they swapped one in to a 1300 (one of the adelaide guys- maybe REV100?) and didn't use a shortened tailshaft, but I think he was wrong and probably went from an auto car to a 5spd.

An auto 1300 tailshaft will apparently bolt straight in to a 1300 with the stock diff centre and 5spd.

When I put a 5spd into my 1300 FA, I had to shorten the tailshaft by 1.5 inches.


Good to know about the 3.9 diff. I want to use the same thing with my STB.

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Tue Nov 21, 2017 6:03 pm 
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Ah very interesting well I think it would be pretty unlikely there is two different boxes but who knows. Auto 1300 tailshaft will be hard to find and even identify for that matter but good to know. I think I jumped into this too blindly as I already had a spare tailshaft that was the 'correct' length but it turned out to have a different pinion flange on it! :roll:

Yep the 3.9 diff bolts in but as I said it's actually a longer carrier like the 12A RX3 item.

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1971 1300 Estate Deluxe
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1979 RX7


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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Wed Nov 22, 2017 10:18 am 
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There's also a shitload of mis information out there.

I had people swear that a 121/626 5spd is the same externally (dimensions) as a 929 4spd, when clearly they are not. Again I got caught out late on a sunday afternoon when I needed the car to go to work the next day. :evil:

It never ever "bolts straight in" !!

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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Wed Nov 22, 2017 7:26 pm 
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Amazing! I was caught out too but didn't need the car to get to work... just to get home after working on the damn thing all day! Frustrating. Nearing the end with it all though. I took the car on the highway today and I think the 3.9's have made a noticeable difference. Bring on 5th gear!

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1971 1300 Estate Deluxe
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 Post subject: Re: 1300 diff centre/5-speed swap - tailshaft?
PostPosted: Thu Nov 23, 2017 3:50 pm 
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I imagine it would because there were loads of 323's out there with 4spds, while the 5 speed wasn't as common.

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